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The runtime team has tracked down a thread corruption bug which produces inconsistent crashes in some cases with a large number of small thread. Some uses of the Xamarin.Mac seem to trigger that more often.
I have uploaded a pre-alpha version of the mono runtime you are welcome to try out:
Be warned however, that this is pre-release software, so expect the possibility of it breaking other things. You can always reinstall the release mono if problems arise.
Please let me know if that fixes your issues. The current plan is to release this fix near the end of the month.
Thanks, Chris, I will install and attempt to reproduce crash.
So far so good. I've been hitting at our UI and haven't yet been able to make it crash. Doesn't mean all is well, but certainly very encouraging. I will update this bug again in a few days if all is still quiet.
I should ask, of course, is there an ETA for moving these changes out of pre-alpha?
The current plan is sometime around the end of the month.